Malicious PDF — malware analysis report

Static analysis result for SHA-256 db37682082c7a945…

MALICIOUS

PDF

90.0 KB Created: 2021-06-10 04:55:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: cf86f93f708470f1f4241ae667a5477c SHA-1: c6b3745940c5fc19f593618c8f71c8ff4866229b SHA-256: db37682082c7a945bfd58b98ec9228f0cddd66390c748fecd931737b05ad10c0
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://medvor.ru/pbw?utm_term=jeff+cavaliere+workout PDF link annotation
    • https://xotixonivared.weebly.com/uploads/1/3/5/3/135347444/4042085.pdfIn PDF document text
    • https://rinixupikexem.weebly.com/uploads/1/3/4/0/134096042/barewa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/2778e4fb-71d3-4c2c-a073-b2bec145c1f6/pablo_neruda_poetry.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/150ff792-d95d-4253-bdb5-3a42f485f39e/download_driver_canon_lbp_6000_for_windows_10_64_bit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db713805-86c4-4735-9b2a-f2b40de481ad/gebapajodunisojuwune.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7b3a510-7044-457f-a8f5-3f8934d27bce/87366337441.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae7fed3a-5732-4b86-a8b4-441b788fc55a/23257559952.pdfIn PDF document text
    • http://gudotoxej.pbworks.com/w/file/fetch/144524064/quimica_organica_e_inorganica_libro.pdfIn PDF document text
    • http://mikabipi.pbworks.com/f/how_to_draw_a_mountain_landscape_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bae68e39-fa09-4c6d-a568-0f879f4ee8ec/pros_and_cons_of_population_control_in_china.pdfIn PDF document text
    • http://jekijuv.pbworks.com/f/alcor_micro_smart_card_reader_software.pdfIn PDF document text
    • http://xereledo.pbworks.com/w/file/fetch/145010322/wakivujudalala.pdfIn PDF document text
    • http://vafakana.pbworks.com/w/file/fetch/144577065/67783430333.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d8903f9-c5c7-49e2-a29f-e88a681d8512/how_do_i_reset_my_frigidaire_air_conditioning_unit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b392b64-e77d-4ed4-8b43-c209f40e48ca/tozanazinunogofa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb640f4e-dc57-4b82-9de2-08bae9f9bd80/86407702448.pdfIn PDF document text
    • http://fafukite.pbworks.com/f/bulalokilomubuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6e7bd49-f722-487e-8de7-384c6e9b642e/what_is_the_best_stock_app_for_iphone.pdfIn PDF document text
    • http://risodige.pbworks.com/w/file/fetch/144924153/kigowojitozi.pdfIn PDF document text
    • http://noxiwako.pbworks.com/f/what_coins_are_worth_money_in_south_africa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9081977e-1eb0-4c67-a836-c8e66724ebbf/modelo_de_minuta_de_constitucin_de_empresa_sac_de_servicios_generales.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35bab2f7-67f6-46a4-8db4-28a43e172cf8/como_traducir_una_pagina_de_espaol_a_ingles_en_google_chrome.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5decaaa4-936d-464e-bf8a-348cc5b3242f/58132865.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10495 4680 bytes
SHA-256: 67715a1ebf304f4343c162c0592fbbdabcc7cbf612695907651fd573ee6b6025
font_01_sfnt_off0001149f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1149F 6044 bytes
SHA-256: 69431030c21c5817d37244909f178e0ea9985a8fe37dddd09e42d7bbee290089
font_02_sfnt_off0001243d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1243D 11448 bytes
SHA-256: 6d9f9b115d83ca05404bbe152ff3df55981cdac1c4443a47303abb8ef1d05e95
font_03_sfnt_off00014aad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AAD 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333